import java.io.*; 
import javax.microedition.midlet.*; 
import javax.microedition.rms.*; 
public class ReadWrite extends MIDlet 
{ 
  private RecordStore rs = null; 
  static final String REC_STORE = "db_1"; 
 public ReadWrite() 
 { 
    openRecStore(); // Create the record store 
    // Write a few records and read them back 
  writeRecord("J2ME and MIDP"); 
  writeRecord("Wireless Technology"); 
  readRecords(); 
    closeRecStore(); // Close record store 
    deleteRecStore(); // Remove the record store 
} 
  public void destroyApp( boolean unconditional ) 
 { 
 } 
  public void startApp() 
 { 
  // There is no user interface, go ahead and shutdown 
 destroyApp(false); 
 notifyDestroyed(); 
 } 
  public void pauseApp() 
 { 
 } 
  public void openRecStore() 
 { 
  try 
  { 
    // Create record store if it does not exist 
      rs = RecordStore.openRecordStore(REC_STORE, true ); 
  } 
  catch (Exception e) 
  { 
   db(e.toString()); 
  } 
 } 
  public void closeRecStore() 
 { 
  try 
  { 
   rs.closeRecordStore(); 
  } 
  catch (Exception e) 
  { 
   db(e.toString()); 
  } 
 } 
  public void deleteRecStore() 
 { 
    if (RecordStore.listRecordStores() != null) 
  { 
   try 
   {  
    RecordStore.deleteRecordStore(REC_STORE); 
   } 
   catch (Exception e) 
   { 
    db(e.toString()); 
   } 
  } 
 } 
  public void writeRecord(String str)
{  
    byte[] rec = str.getBytes(); 
  try  
  { 
   rs.addRecord(rec, 0, rec.length); 
  } 
  catch (Exception e) 
  {  
   db(e.toString()); 
  } 
 } 
  public void readRecords() 
 { 
  try 
  { 
      byte[] recData = new byte[50]; 
   int len; 
      for (int i = 1; i <= rs.getNumRecords(); i++) 
   { 
        len = rs.getRecord( i, recData, 0 ); 
        System.out.println("Record #" + i + ": " + 
    new String(recData, 0, len)); 
    System.out.println("------------------------------"); 
   } 
  } 
  catch (Exception e) 
  { 
   db(e.toString()); 
  } 
 } 
  /*-------------------------------------------------- 
    * Simple message to console for debug/errors 
    * When used with Exceptions we should handle the 
    * error in a more appropriate manner. 
  *-------------------------------------------------*/ 
  private void db(String str) 
 { 
    System.err.println("Msg: " + str); 
 } 
}